Müller concluded an address at one of the Clifton Conferences of Christians, at which he had taken as his text 2 Corinthians 5:7,
'We walk by faith, not by sight,' with these words:
We have to believe what God says. Nor must we look to our feelings, nor expect help from our natural fallen reason; nor must we be discouraged though all appearance were against what God says; for faith begins when sight fails. As long as we can see with the natural eye, and our natural fallen reason will yet help us, faith is not needed.
Excerpt from Spiritual Secrets of George Müller (selected by Roger Steer).